Which is true of hemophilia?
A) It is more likely to afflict sons of female carriers than daughters.
B) It occurs more often in Caucasians than other racial and ethnic groups.
C) It damages the frontal lobe of the brain.
D) It often co-occurs with Down syndrome.

Question

Quizplus · Accepted Answer

Hemophilia is a genetic disorder that affects the blood's ability to clot. It is X-linked recessive, meaning it is carried on the X chromosome. Since males (XY) have only one X chromosome, if they inherit the affected X chromosome from their mother, they will express the disease. Females (XX), on the other hand, would need to inherit two affected X chromosomes (one from each parent) to express the disease, which is much less likely. This is why hemophilia is more common in males than in females.

Which Is True of Hemophilia